irrefragable

The charge is utterly groundless; and in the case of Bettine has been refuted by irrefragable proof.

His object is not to frame an irrefragable argument, but to produce an irresistible impression.

Tradition is to be scouted when it is found inconvenient, but cited as irrefragable truth when it suits the case.

He is unusually accurate, punctual, lucid; an irrefragable authority on English points.

These are, however, an irrefragable proof that the Treasure belongs to the city and to the age of which Homer sings.